Copyleaks AI Review

Copyleaks AI Detector estimates how much of a text is likely AI-generated, including text from ChatGPT, Gemini and Claude, and on paid plans combines that with a plagiarism check in one report. You paste or upload content; Copyleaks says its model looks at frequency ratios against large datasets, parts of speech, syllable dispersion and hyphen usage, and returns the share of the content it considers AI-written. Its paid AI Logic view explains why text was flagged: AI Phrases shows how often a phrase appears in AI rather than human writing, and AI Source Match finds passages already published elsewhere. Copyleaks also sells AI image detection, and a site banner says AI video detection is now live.

You can use it on the web without logging in for up to 25,000 characters, create a free account for more monthly credits, or work inside other tools: a Chrome and Edge browser extension, a Google Docs add-on, an API for embedding detection in your own product, and LMS integrations for Canvas, D2L Brightspace, Moodle, Blackboard, Schoology, Edsby and Sakai. Copyleaks says it supports AI detection in more than 30 languages, including English, French, German, Italian, Portuguese, Spanish, Japanese, Chinese, Russian and Dutch, and plagiarism detection in more than 100.

Individual plans (one credit covers 250 words or one image):

Yearly billing saves up to 25% (Personal 18%, Pro 25%). Personal includes AI and plagiarism scanning in one report with AI Logic, AI image detection, multi-file upload, the browser extension, the Google Docs add-on and MCP access for AI assistants. Pro adds advanced detection filters, whole-website scans, cross-language translation detection and an analytics dashboard. Extra credits can be bought at any time on the platform (prices not listed on the pricing page); taxes may apply, and plans can be cancelled at any time.

Prices checked on the vendor's pricing page on November 2, 2026. See Copyleaks pricing.

What Copyleaks lists for its AI detector:

Copyleaks suits students and writers who want to check a draft before submitting it, educators and institutions that want AI and plagiarism checks inside their LMS, and teams or platforms that need detection through an API or in many languages. The free 25,000-character scan is enough to try it on a typical essay without signing up.

AI detection is probabilistic, and Copyleaks' own page warns that tools like Grammarly can cause writing to be flagged. If you want a second opinion, run the same text through GPTZero or Originality.ai. Schools already on Turnitin may not need another tool, and writers who mainly want rewriting help should look at QuillBot.

Reviews are split. On Trustpilot Copyleaks has a TrustScore of 2.7 out of 5 from 387 reviews, with 40% five-star and 48% one-star ratings. Positive reviewers say it is easy to use, with clear and thorough reports, and useful for checking papers or CVs before submission. The most common complaint is false positives: reviewers say human-written work, including creative writing, was flagged as AI, and that the same document gave different results on different scans. Others say credits run out quickly and support is slow; Copyleaks replies to some reviews. Copyleaks itself claims over 99% accuracy and a 0.03% false-positive rate, citing its own testing methodology, so treat any single score as a signal rather than proof.